Thomas Engine #1 Petite Cake Topper. Now you can build an unique Thomas the Tank Engine birthday cake using this petite signature cake topper. If you have a Thomas the Train fan in your house then this cake topper will be perfect for your next birthday party! When done with the cake give this topper to the birthday boy or girl for a fun viewing experience. Simply hold up to a light source and turn the gear and you will see different views of Thomas and his friends. Cake topper measures 4.5 inches round by 1.5 inches tall. Suitable for ages 3 and up.